An air pollution advisory issued last week has been extended until Friday at noon as haze from Northwest wildfires continues to hang over Portland.

Continuing hot weather and wildfire smoke will continue to affect air quality through the end of the week, the Oregon Department of Environmental Quality said Tuesday. The advisory has been extended for Portland, Vancouver, Salem and Eugene.

The advisory was issued last Wednesday and was initially set to end Tuesday night.

Last week, triple-digit heat and smoke made Portland's air quality unhealthy, with levels of pollution exceeding those in Beijing.

Though conditions will not likely be as extreme this week, the DEQ expects smog and temperatures in the 90s will make air quality levels unhealthy for sensitive groups in the Portland metro area.

The DEQ asked motorists to avoid driving and using gas-powered yard equipment or aerosol sprays. Older adults, children and people with asthma and heart or lung conditions should limit their time outside, the DEQ said.

The Southwest Clean Air Agency, which enforces air quality standard in Southwest Washington, also extended an air quality advisory for all of Southwest Washington until Friday.